Every large format text box in MaidCentral has the ability to insert images or photos into the text. The "Insert Image" option is one of the last option on the menu so you will most likely need to expand the menu using the 3 dots in the top right.
This option will open up the Image modal. Click the "Source" button in the top right and there you will be able to upload a new image or select an existing image. Once the image source is selected you can add a description and change the size to be more mobile-friendly!